<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">
	
var lastTime = new Date().getTime();
//toString();
//String(number);
//+'';
for(var i =0;i<100000;i++){
	var a = document.body;
	var b = a;
};
var nowTime = new Date().getTime();
alert(nowTime - lastTime);

</script>
</body>
</html>